单项选择题

A．It is illegal.
B．It is bad.
C．It is unfair.
D．It is acceptable.
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单项选择题
A．Some pessimistic experts.B．Environmentalists.C．Some optimistic experts.D．All of the above.
A．Some pessimistic experts.
B．Environmentalists.
C．Some optimistic experts.
D．All of the above.
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